Hydraulic jail-door-locking mechanism



March 4 1924;

J. ALLENSON HYDnAULIC' JAIL DOOR LOCKING MECHANISM 6- sheeis-sheet 1 Filed June 12 1919 saw ' J flaw m MW y March 43, 1924. 1,485,756

J. ALLENSON HYDRAULIC JAIL DOOR LOCKING MECHANISM Filed June 12, 1919 6 Sheets-Sheet 2 I iii/2671237":

707m/ lleiisa l -March 4,1924. 1 1 11,485,756

J. ALLENSON HYDRAULIC JAIL DOOR LOCKING MECHANISM Filed June 12 1919 e sheets-sheet 5 March 4 1924."

J. ALLENSON HYDRAULIC JAIL DOOR LOOKING MECHANISM Filed June 12 1919 6 Sheets-Sheet 4 Marc 192g. 1,485,756

-J. ALLENso HYDRAULI C JAIL DOOR LOCKING "MECHANISM Filed June 12 1 919 4 6 Sheets-Shee 5 fiQnJZZemso Q March 4 1924.

1919 6 Sheets-Sheet 6 J. ALLENSON HYDRAULIC JAIL DOOR LOCKING MECHANISM Filed June 12,

Patented Mar. 4, 1924.

UNITE STATES "485,756 PATENT OFFICEZ JOHN ALLENSON, OF ST. PAUL MINNESOTA, ASSIGNOR TO ST. PAUL FOUNDRY COM- PANY, OF ST. PAUL, MINNESOTA, A CORPORATION.

HYDRAULIC. J'AIL-DOOR-LOCKING MECHANISM.

Application filed June i2, 1919. Serial No. 303,756.

all h m it may concern:

Be it known that 1. JOHN ALLENSON, a

citizen of the United States, residin at St. Paul, in the county of Ramsey and tate of hlinnesotu, have invented a new and useful lmprmeiuent in Hydraulic, Jail-Door-Locking Mechanism, of which the following is a specification.

This invention pertains to jail door lockdoors, especially mechanism whichimay" easily get out of order and which requires considerable attention. This invention overcomes these difliculties in an extremely sunple and effective manner, by a combination of elements which securely lock each and every cell and by a hydraulic means winch operates the locking mechanism of each cell into either a dead-lock position or other positions that may be desired.

The hydraulic operating mechanism is extremely siniple, be1ng controlled by a master valve, and operates means which is connected witha series of cell locking means so that when the hydraulic means is operated, the cell locking mechanism is also operated, but the-hydraulic mechanism is not for the purpose of opening by actually engaging and pulling the cell doors. Thus, the hydraulic operating means is independent of the actual opening ofthe cell doors and'isoperated in a peculiar manner, which is very effective same. The door locking nism for a series of doors can beoperated b hand, particularly where the gang contro ling mechanism is used in-connection'with a series or tier of. straight cells, that is, cells that are not arranged in a circle or curve, and which do not requirethe power for operating the same that 1s .necessary in cells arranged ina curve. This is clearly evident "line 9 9 of F "in operating the mechanism connected to the" from the fact that the operating bar or gangcontrol is practically straight when the cells are arranged in a straight line.

'An important feature of this invention is a simple means for illustrating to the jailer fication:

Figure 1 is a diagrammatic plan View of a circular prison, illustrating the position of the cells in the same.

Figure 2 is a diagrammatic cross sectional elevation of'a portion of the prison construction:-,." A

Figure 3 is a front elevation of a portion of the cells, havinga portion broken away to disclose the operating parts in the mechanism compartments.

Figure 4 is a front elevation of a portion of a cell and the locking mechanism in open position. a

Figure 5 is a detail of a portion of the locking mechanism partly illustrated in cross section.

Figure 6 is a perspective view of one of the cell door locking bars.

Figure? is a vertical sectional view of a portion of the cell on the line 77 of Figure 3. v

-Figure-8' is a vertical section on the line -8 8 of Fi ure 3, a portion of a division wall being roken away.

Figure; 9 is a sectional plan view on the igure 3. v Figure 10 is a plan view of themaster valve. and unlocking mecha- Figure 11 is a sectional side elevation of ill) the master valve on the line 11 -11 of Figure 10.

Figure 12- is a diagrammatic plan view, illustrating the position of the master valve and the hydraulic cylinders, as they would be located in the circular prison of the construction illustrated in Figure 1.

Figure 13 is a front elevation of a por tion of a series of cells, illustrating the locksuitab e notches in the lugs ing mechanism in open position and the gan controlling means operable by hand. F lgure 14 is an end view of the hand operated means, illustrated in Figure 13,

which also illustrates a device to indicate the position of the locking mechanisms.

1 The drawingillustratesacircular prison A, 'having a series of cells B positioned circularly so 'as to make up the cell construction. The doors of the cells B are positioned on the inner portion of the cells and are in full view of the jailer or guard at all times when he is in the conning or operating tower D. This construction of jail is desirable, as itpermits each cell to have an outside window to admit light and air and gives alarge corridor E about the tower D on the first floor. The oors of the jail are provided with connin other circular balconies F in' front of the cellsto allow'the prisoners from the cells to go in and out and leaving the center portion of the jail entirely open fromthe first floor up, so that a skylight can be provided on the roof, thereby making a very light, airy and pleasant jail; This construction of jail attached thereto latch lugs 2, 3 and 4, which pass through suitable openings in the door amb 5', and are adapted to be engaged by a sin le locking bar 6, which engages in and which is slidablyheld'to the inside of the door jamb 5 by the bolts 7, in the ordina manner. The locking bar 6 engages in t e notches of the In s 2, 3 and 4 to hold the door C locked w en in closed osition and it is desired to have the 'cell locked.

Each cell B is provided with a key lock G for the door C, which engages the latch lug 3 when the door G is in closed position and locks the latch -lu' 3 therein in addition to its being locked 6. Each of thedoor'locks G contain the mechanism of the individual door lcek Q and the individual dead-lock 9, and which is. of ordinary construction so that when the cell locking bars are released from dead-locking position, any of the doors C can be opened y 'operatin the locking mechanism in the locks G wit the key which is provided for the same.

The drawings illustrate the cell doors C, and the stationary front ortions of the cells H made up of steel sas having glass inserted and held therein to provide closed fronts for the cells. Above the glass cell fronts a mechanism box or passageway J is formed, in which a gang-bar 10 is positioned. In the circularprison A, the gang bar 10 is preferably practically semi-circular in shape and extends longitudinally by the locking bar through the mechanism passageway J, it being obvious, however, that where the prison construction is such that the cells are posltioned 1n hnc with each other and locking bar 6 and positioned at a point-on the gang-bar 10 so as to operate thelocking bar '6 when the gang-bar 10 is moved or reciprocatcd back and forth in the mechanism chamber J. The gang-bar 10 is held longi tudinally, freely movable in the guide brackets 13, which are provided with horizontally extending rollers 14 that engage the upper and lower surface of the cam member 11 and vertically extending rollers 15, which engage the-sides or front. and back of the cam member 11, while the guide brackets 13 are rigidly secured to the rear wall of the mechanism chamber by the rivets 16. In this manner the gang-bar 10 is held freely movable longitudinally in the mechanism chamber J in either dl1QCtl0Il.*

The locking bar 6 is pivotally connected on its upper end to a voke 17 by means of the connecting rod 18, and the yoke 17 is held freely slidable up and down under the strap 19, which is rigidly secured to the in extending rollers 21, which are freely held by the pin 22 in the yoke 17. Rollers or wheels 23 are positioned on either side of the rollers 21, and are of a larger diameter than the rollers 21 so as to engage the strap 19, and the division wall 300 between which the yoke 17 is slidably held to hold the same freely movable up and down and to reduce friction. The cam member 11 holds'the .yoke in position between the strap 19 and the division wall 300 and the rollers 21 and 23 allow the cam member 11 to be freely moved in either direction through the yoke 17.

The cam member 11 is formed with a depending cam portion 24, which engages the lower set of rollers 21 and 23 in the yoke 17, to hold the locking bar 6 in a'downward, dead-locking position and holding the yoke 17 immovable up and down as the upsaid surface 25 and the depending portion 24, which has a surface that is parallel to the lower edge 27 of the gang-bar 10, is practically equal to the distance between the upper and lower rollers 21 in the yoke '17. The cammember 11 is' formed with a lower surface or edge 28, which extends parallel to the lower edge 27 of the gang-bar up to the inclined surface, which leads. to

the depending surface 24. .This' edge 28 forms a space in conjunction with the edge on the cam member 11 at the point 29,

' where the yoke 17 is held freely, to be moved the yoke 17on the cam member at the point.

' 29 would be as illustrated in Figure 5, and

I this point would be the key opened position of the yoke 17 on the cam 11.

The doors 0 ofu'h cell are hung at their upper end on the rollers 30, in the ordinary, well-known manner, adapted to. travelflmv the track 31 in the mechanism chamber J, allowing the doors- C to be opened freelywhen they are unlocked. V. a.

The shaft 32, which carries the roller-30, of each of the doors nearest the door jamb 5, has a ratchet bar 33- pivotally secured thereto on one end, which lies' on the bottom of the. mechanism chamber J and is engaged by ratchet pawl 34, which is.

pivotally-secured at 35 in the mechanism chamber J The pawl 34 is provided with a laterally extending lug 36, which extends in the path of the lug 37- formed on the back and projecting from the yoke 17, so that when the yoke 17 is elevated or raised by the cam member 11, the ratchet pawl 34 is disengaged from the teeth of the ratchet bar 33, leaving the samefree to move in a direction to open the door C. This ratchet mechanism is for the purpose of preventing the door 0 from being opened after it has been partially closed, when the locking bar is in its,downward position and the upper roller 21 of'the'yoke 17 is riding on the edge 25 of the cam member 11, as is illustrated in Figure 5. Thus, the ratchet mechanism prevents any possibility of the door C being only partially closed, that is, closed all but a small crack, which would hardly be noticed by the jailer, the prisoner having the intent of preventing the lugs 2, 3 and 4 'from being engaged by the locking bar and afterward opening said cell. Thus making the locking mechanism positive in operation and preventing any danger of the door being held open slightly, so as to be opened afterward whenthe locking mechanism is set in dead-locking position.

which rollers are .17pis engaged by the surface 38. construction of the yoke is such that the bar while the door is opened. In this manner, any or all of the doors C can be locked open, if it is desired. v

The cam member 11 1s provlded with an upwardly projecting surface or edge 38, which extends parallel to the upperedge 26 of the gang-bar 10, and is for the purpose of engaging the yoke 17 to raise the same and cause the lug 37 to engage the lug 36 of the pawl 34, to release the pawl from the ratchet bar 33. This surface 38 is adapted to raise the locking mechanism into ratchet,

releasing position, as illustrated in Figure 3' of the drawings, but does not, however, raise the unlocking bar 6 entirely out of engageinent with the notches in the lugs 2, 3

{and 4.

While the drawings illustrate the cam .member 11 so constructed as to work in conjunction with the yoke 17 to release the ratchet mechanism of each of the doors when the yoke is engaged by the edge 38 of the samc it is evident that the ing 37 on the yoke can he so positioned that the .yoke' will only partially release the pawl 34 of the ratchet mechanism when the yoke ratchet mechanism is only partially released when engaging on the edge 38 and the lock- If the ing bar 6 is only partially released, this position is desirable for relieving the wear on the lugs 2, 3 and 4 and the lug engaging slots formed in the locking bar 6, as it will be evident that if the ratchet mechanism and the locking bars 6 are partially released,'it is not necessary for the lugs 2, 3 and 4 to raise the locking bar so far to admit the lugs to lock the door C. and thus the friction is reduced in closing the door of the cell and wear on the connecting parts is also materially reduced. In some instances, it is desirable to have the ratchet mechanism only partially released by the yoke 17 when the same is engaging the surface 38. This is optional, however, with the jail engineers. as they sometimes prefer to have the ratchet mechanism entirely released at one position of the operating bar.

The cam member 11 is also provided with an upwardly projecting portion or edge 39, which 'is higher than the edge38 and extends parallel to the upper edge 26 of the gang-bar 10. This edge engages the yoke whose locking mechanism is operated by the gang-bar 10, to be opened simultaneously by operating the ang-bar 10 into the position illustrated in F igure 4. The gangbar 10 operates the cam members 11 into four distinct positions, namely, dead-locking position when the yoke engages the surfaces 24 and 25, key opening position when the yoke engages at the'point 29 and is in the same position as it would be when in dead-locking position, hanging with its weight on the upper roller 21 in the yoke, engaging against the surface 25, but with the lower roller 21 free to move upwardly to the point, of engagement of the surface or edge 28, the third position being, theratchet releasing point on the cam 11 when the yoke 17 is partly elevated by engaging bar 10 and the relative position of the lock-t ing and unlocking means. Said first abovenamed position is indicated by the letters D. L. at 42, the next by K; 0. at 43, the third by L. O. at 45, all of which are clearly visible with the pointed endof the pointer 40 through the glass 41, as is illustrated in Figure 3 of the drawings. In this manner,

- the jailer. can readily see the position in means of the connecting arm 50, which is which the locking mechanism is at any time.' r

" llhe gang-bar 10 is operatedby fluid cyl-, inders 46, having a piston 47 of ordinary construction, which operates or reciprocates the piston rod 48' and the free 'end of the piston rod 48 is freely slidable in the bearing 49; The cylinder 46, together with the bearing 49, are secured together and attached in a suitable manner to the upper portion of themechanism chamber J, being so positioned as to be best connected to operate the bar 10, The piston rod 48 is connected with the bar 10 by rigidly secured on one end to the piston rod 48, and the free end of which freely engages in the brackets '51, which is rigidly secured to the gang-bar 10 in a suitable manner, so that when the piston 47 is reciprocated in the cylinder 46, the arm 56 will operate the gang-bar 10 in a similar direction as the travel of the piston 47 in the cylinders 46.

The cylinders 46 are positioned in any suitable place in the mechanism chamber J to operate the gang-bar 10 most effectively, and for convemenceFigure 12 of the draw- R. R. at 44 and the -fourth byv inders 46 as shown in Fig. 3 are connected,

in series by the pipes 53and 54, which lead from the master valve 52 to either side of the piston 47, and the pipes 53 and 54 connect with the passageways 55 and 56, respectively, which are formed on the cylinder and extend longitudinally of the same, the passageway 55 connecting with the piston chamber 57 at '58 on one side of the piston 47 and the'passageway 56 connecting the piston chamber 57 at the other side of the piston 47 at the point 59 so that when fluid pressure is directed by the master valve into the pipe 53, the'pistons 47 of the cylinders 46 will be operated in a direction to move the gang-bar 10 into unlocking position and in'the direction illustrated by the arrow 60 in Figure 3, while when the fluid pressure is directed from the master valve into the pipe 54, the cylinders 46 will cause the gang-bar to be moved in the direction of-the arrow 61, illustrated in Figure 3. Thus the pipe 53 will direct pressure to the cylinders 46 to unlock the mechanism of the cells simultaiieously, or to move the gang-bar 10 into the position indicated by thepointer 40, and the pipe 54 from the master valve will cause the cylinders 46 to movein a locking position to dead-lock, ifdesired, all of the cells, simultaneously, whose mechanism is connected with the bar 10. It is obvious that the locking bar 10 could be a complete circle to operate all of the cells on one floor of the circular prison A, if it is desired, and if such were the case, the operatlng mechanism would'accomplish the functions described in an equally ellicient manner, but the drawing,.

for convenience, merely illustrates half of the cells on each floor, connected together bysuitable source of fluid pressure to direct and maintain the desired amount of fluid pressure in the chamber 64 of the master valve at all times. The slide valve 63 is operated by the pinion 68, which engages with the rack 69 on the valve. the pinion 68 and the handle 62 being rigidly secured in a suitable manner to the shaft 70. In this manner,,the valve 63 is operated freely in the deslred direction even when considerable pressure is exerted against the same by the fluid in the chamber 64.

It is-desirable to use water or oil for fluid pressure in the operation of the locking mechanism in this device, but it is obvious that any other suitable fluid may be employed if it is desired, and also that air pressure can be used, if it is so desired. The passageways connecting the master valve with the-cylinders 46 are filled with the fluid which operates the pistons in the cylinders, and when the valve 63 is moved into-the position illustrated in dotted lines in Figure 11, fluid pressure will be directed to the pipe 54 through the passageways 66 to operate the piston 47 in the direction of the arrow 61 and operate the gang-bar 10 in a similar-direction to locking position, the piston 47 forcing the fluid pressure on the other side of the same out of the piston.

chamber at 58 into the pipe 53, which be- 1 comes and performs the functions of an exhaust pipe and causes the fluid .therein to be directed back to the master valve and through the-passageway 71 of the valve 63 and out of the master valve, through the exo hau'st ort 72 into the exhaust pipe 73. If

the va ve 63 of the master valve 52 is moved in the o posite direction to that illustrated in dotted outline in Figure 11, so that the pressure from the chamber 64 will be directed into the pipe 53 from the passageway 65, then the pistons 47 of the cylinders 46 will move-in an opposite directionand the pipe 54 becomes an exhaust pipe to exhaust the fluid from the cylinders 46 back to' the master valve and into the exhaust pipe 73. Thus the master valve will direct fluid pressure to either side of the pistons 47 of the cylinders 46 to operate the gang-bar 10 and [tosimultaneously operate all of the locking mechanism of each of the cells B, which are connected to the same. It is essential, however, in the use of fluid pressure, that the connecting pipes and passageways, together with the'cylinderslti, be filled with a fluid at all times, thus avoiding any jarring or sudden jerking of the pistons and gang-bar 10 when the master valve is operated. The passageways leading from the passageways 55 and 56 at the points 58 and 59 are only. large enough to admit the fluid pressue to the cylinders 46 slowly, so that no sudden.

jar will be transmitted to the same and cause in uneven operation of the locking mechanism.

It is obvious that any suitable fluid pressurecan be connected to the intake pipe 67 of the master valve and that the exhaust pipe 73 of the same can be connected with an overflow or reservoir tank so that the fluid used in o crating the cylinders can be over again, and suitable pumping mechanism, together with pressure regulating means,"all of ordinary construction, connected with the same, it being essential, however, that the passageways be filled with fluid at all times so as to prevenl air from mixing with the fluid in the pipes and passageways and causin a chattering 1' uneven operation of the pistons 47 in the cylinders 46.

It is obvious that one or more cylinders occasion requires, this, of course, depending on the number of door mechanisms connected to the operating bar, Figure 1,. illustrating, diagrainmatically, the position of the n i can be used to operate the gang-bar 10, as

cylinders 46 in relation to the bar 10 when three cylinders are-'use'd for a semi-circular operating bar. This diagrammatic figure also illustrates the position'or'v the-master valvel 52 in the jailers conning tower D. The sim the cylinders 46, thus eliminating the necessity of any pumping mechanism, there only being a small amount of fluid wasted whenthe cylinders are operated, as it is evident that the only fluid which will-be exhausted into the exhaust pipe 73 is that which is in the cylinders 46 and which is forced out of the same when the pistons, 47 .are moved in either direction. o

In connecting the cylinders 46 in series by the pipes 53 and 54, with. the master valve, and the particular construction oflocking and unlocking mechanism, illustratcd, a very simple, efl'ective and practical jail locking and operating mechanism is'provided, which is not apt to get out of order or require considerable attention, this being a very important feature in a practical jail lock operating mechanism.

In Figures 13 and 14 the gang-bar 10 is moved back and forth by a hand operating mechanism K, which is positioned in a suitable enclosing box L at one end of the se ries of cells. In this construction, the gangbar 10 has a threaded end 80 secured to the same in any suitable manner, which is engaged by the sprocket wheel 81. The sprocket wheel 81 is held between thrust bearings 82 of any suitable construction by means of the bracket 83 and is operated by the sprocket chain 84. which passes over the sprocket wheel 85. The sprocket wheel 85 is adapted to be operated by a hand crank 86, in an ordinary manner, so as to rotate the sprocket 85 and drive the chain 84 to operate the rotation of the same. By the hand '0 erated meclnnism K, the cams 11 connecte to the bar will be moved back and forth to opcrate the key lugs B and the locking bar 6 ,in similar positions and directions as operated by the hydraulic mechanism. This construction is particularly adapted to cell doors which extend in a straight line or plane with each other and in a prison construction where the cells are all positioned straight with each other and not on a curve.

A suitable gauge 87 in the form of a weight or other suitable means, is hung by the cable .88 from the boss 89, which projects from one side of the sprocket 81, the portion 89 forming a drum upon which the cable '88 can be wound or unwound to move the gauge or weight 87 up and down in the operating box L. The gauge 87 isformed with a suitable pointer 90, which when in line with the marks or gauge lines 91 on the inner wall of the box L, designate or indicate the exact position of the locking bar 10, thus illustrating at a glance to the jailer operating the hand mechanism, the positionv of the gang-bar 10, cams 11 and the relative posi-- tion of the unlocking bars 6, which is a very importantfeature in the successful operation of tliishrivfitiom' The gauge 87 performs' the same functions as the indicator 4Q, illus trated in Figure 3, t being evident that the construction illustrated in Figures 13 and 14 are more adaptable to smaller jails, where a less expensive construction is desired, but iiliflwhich equally effective results are obtaina e.

In accordance with the patent statutes I have described the principles'of operation of my invention, together with the apparatus which I now consider to represent the best.-

embodiment thereof, butI-desireto have it understood that the construction shown is only illustrative and that the invention can be carried out by other means and applied to uses other than those above set forth, within the scope of the following claims:

1. 'The combination in a door lock actuating device, of slidable doors, latch lugs. on said doors, a locking bar for engaging said lugs to lock said door, a horizontal slidable cam. for operating said locking bar intolocking or unlocking position,fluid,pressure devices connected inseries to said slidable cam for operating said cam longitudinally and a master valve for controlling the operation of said fluid pressure devices to cause them to operate said horizontally slidable cam.

2.. In combination with a series of slidable a plurality of cylinders connected to said movable member at intervals throughout the length thereof, a source of fluid pressure and means for connecting said source of fluid pressure to said cylinders to operate the same.

3. The combination with a series of slidable doors, independent locking mechanism for each of said doors, operating means engaging said locking mechanisms to cause said locking mechanisms of said doors to be operated simultaneously, said operating means comprising a gang-bar having a series of cams fixedthereon for each of said door locking mechanisms and a fluid pressure device for operating said lock operating means to move said gang-bar longitudinally to operate the locking mechanisms of eac of said doors simultaneously for the purposes specified.

4. The combination with a series of slidable doors, independent locking mechanisms for each of said doors, a longitudinally slidable gang-bar having means for connecting with and operating said door locking mechanisms, a fluid pressure device for operating said gang-bar to cause said door looking mechanisms to be operated simultaneously to lock or unlock said doors and enclosed indicating means adapted to indicate the position and operation of said gang-bar'- .and door locking mechanisms.

5. A locking device for slidable doors,

said device including horizontally slidable cammembers having a series of cam faces formed thereon, a gang-bar connecting said cam members, a vertically slidable locking bar, latch lng's fixed to said doors having notches which are adapted to be engaged by said locking bar.when the same is in looking position, a vertically movable yoke adapted to ride on said cam member and to be reciprocated vertically by thecam faces of said cam Vmember, means connecting said yoke with said locking bar and fluid power means for reciprocating said gang-bar horizontally to operate said locking bar.

6. A locking device for a series of slid-- abledoors, said device includinga vertically slidable locking bar, notched latch lugs secured to each door adapted to be engaged dividually and fluid power means for opersaid fluid pressure to either side of the pistons 'of said-cylinders to move the same simultaneously in the same lon itudinal direction to operate said contro ling bar in ..a similar direction, the means connecting.

said cylinders with said source of fluid pressure being adapted to be filled with fluid at all times, an exhaust port connected with said master valve to allow the escapementof the surplusfluid in said connecting means when the pistons insaid cylinders are operated,

a locking bar for engaging latch lugs on 4 said doors and means connecting said locking bar with said controlling bar, whereby the locking bars of each door will be operated by said controlling barwhen the pistons in said cylinders'are operated-by fluid pressure.

8.-A lockingdevice for a series of slidable doors, including slidable locking bars for each of said doors,-a gang operating bar,

cam faces on-said gang-bar, means connecting said locking bars with-the cam faces on said gang-bar, afluid pressure device for operating said gang-bar a controllin valve for directing uid pressure to said fluid pressure operating device to cause said gang- -bar' to be reciprocated longitudinally by said fluid pressure'device, key operated locking. means for each of said doors and a ratchet locking means for each of said doors to hold said doors against movement in an open direction when said ratchets are in operation,

said-cam faces on said controlling bar being adapted to operate said locking bars of said doors simultaneously when said controlling bar is operated by said fluid pressure device to dead-lock said locking bar against movement in one position, to release said locking bar so as to' be-operated by said key locking means in another position, to release said ratchetlocks simultaneously in a third 1po- "sition, -fourth, to lock said locking QLdoors, including a slidablelocking bar for" against movement in open position, forthe purposes specified.

9. A locking device for a series of slidable each door, a-gang' controlling bar for operating saidlocking bar into four distin sitions, fluid pressuredevices for .o

said controlling bar, 'saidj'fluid pr 'de-- vices being all connected in series td'aid' gang controlling bar and a master valve for connecting said fluid pressure devices with a source of fluid pressure so as to o erate. said fluid pressure devices to move s'ai controlling bar into said four positions for the purposes specified.

10; The combination with a circular I 4 prison, of'a plurality of slidable doors, with independent locking bars, key operated locking means for each of said doors, ratchet locking means for each of said doors,-a curved controlling bar having means for operating said locking bars, key operated locking means and said ratchet locking means simultaneously, fluid pressure devices connected in series for operatingsaid curved controlling bar, a master valve for controlling said fluid pressure devices and indicating means to indicate the position of said curved controlling bar for the purposes specified. Y

11. In combination with a door having a latch look, a vertically slidable latch-bar adapted to engage said latch-lock, a yoke secnred'to the upper end of said latch bar having upper and lower 'camengaging portions positioned'infixed relation to one another, a gang-bar slidable through said yoke and a cam plate secured to said gang-bar having ofl-set cam portions of a' width equal to the distance between said cam engaging portions of said yoke and ada ted tobe endead locked or open position, and another portion of said cam plate of awidth' less then the distance between said cam engaging portions of said yoke adapted to be engaged gaged thereby for holding sai latch-bar in thereby for permitting said latch-bar to be manually raised from said latch-lock at will.

12. A locking device for a series of slidable doors, including a slidable locking bar for each door, a longitudinally slidable gang controlling cam bar for operating said looking bars, pressure cylinders for operatin said controlling bar,'pipes connecting said cylinders in series with each other and a master valve connected with said connecting means adapted to direct and control pressure to cause the pressure cylinders to operate longitudinally said gang cam bar in either directioninto various positions and said pipes connecting said cylinders acting as intake and exhaust pipes from said valve auto matically to cause'said cylinders to operate said controlling bar in either direction for the purposes specified.

' JOHN ALLENSON.

Rouse: 

